/**
 * Javascript auto-completion for form fields. jQuery based in 1.1.5.
 * Different types of auto-completion fields can be defined (e.g. with different data sets). For each one, a schema
 * can be created describing how to draw each row.
 */

var autofill_schemas = window.autofill_schemas || {};

/**
 * SCHEMA - GENERIC
 */

autofill_schemas.generic = {
	init: function(element, fillclass, params)
	{
		$(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass) + '&userinput=', {
				minChars: 3
		});
	}
}

/**
 * SCHEMA - USERNAME
 */

autofill_schemas.username = {
	init: function(element, fillclass, params)
	{
		params = params || {};
		var allow_anon = params.allow_anon ? '1' : '0';
		$(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass + '&allow_anon=' + allow_anon) + '&userinput=', {
				minChars: 3,
				formatItem: function(row, _, __)
				{
					var html = row.name_highlight + ' &ndash; ';
					html += '<span style="' + row.rank_style + '">' + row.rank_title + '</span>';
					return html;
				},
				tableHeader: '<tr><th>' + $lang.get('user_autofill_heading_suggestions') + '</th></tr>',
				showWhenNoResults: true,
				matchCase: true,
				noResultsHTML: '<tr><td class="row1" style="font-size: smaller;">' + $lang.get('user_autofill_msg_no_suggestions') + '</td></tr>'
		});
	}
}

autofill_schemas.page = {
	init: function(element, fillclass, params)
	{
		$(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass) + '&userinput=', {
				minChars: 3,
				formatItem: function(row, _, __)
				{
					var html = '<u>' + row.name_highlight + '</u>';
					html += ' &ndash; ' + row.pid_highlight;
					return html;
				},
				showWhenNoResults: true,
				noResultsHTML: '<tr><td class="row1" style="font-size: smaller;">' + $lang.get('user_autofill_msg_no_suggestions') + '</td></tr>'
		});
	}
}

window.autofill_init_element = function(element, params)
{
	if ( element.af_initted )
		return false;
	
	params = params || {};
	// assign an ID if it doesn't have one yet
	if ( !element.id )
	{
		element.id = 'autofill_' + Math.floor(Math.random() * 100000);
	}
	var id = element.id;
	
	// get the fill type
	var fillclass = element.className;
	fillclass = fillclass.split(' ');
	fillclass = fillclass[1];
	
	var schema = ( autofill_schemas[fillclass] ) ? autofill_schemas[fillclass] : autofill_schemas['generic'];
	if ( typeof(schema.init) != 'function' )
	{
		schema.init = autofill_schemas.generic.init;
	}
	schema.init(element, fillclass, params);
	
	element.af_initted = true;
}

window.AutofillUsername = function(el, allow_anon)
{
	el.onkeyup = null;
	el.className = 'autofill username';
	autofill_init_element(el, { allow_anon: allow_anon });
}

window.AutofillPage = function(el)
{
	el.onkeyup = null;
	el.className = 'autofill page';
	autofill_init_element(el, {});
}

// note: init, then onload (the latter is called automatically)

window.autofill_onload = function()
{
	if ( this.loaded )
	{
		return true;
	}
	
	var inputs = document.getElementsByClassName('input', 'autofill');
	
	if ( inputs.length > 0 )
	{
		// we have at least one input that needs to be made an autofill element.
		// is spry data loaded?
		load_component('l10n');
	}
	
	this.loaded = true;
	
	for ( var i = 0; i < inputs.length; i++ )
	{
		autofill_init_element(inputs[i]);
	}
}

window.autofill_init = function()
{
	load_component(['l10n', 'jquery', 'jquery-ui']);
	
	if ( !window.jQuery )
	{
		throw('jQuery didn\'t load properly. Aborting auto-complete init.');
	}
	
	jQuery.autocomplete = function(input, options) {
		// Create a link to self
		var me = this;
	
		// Create jQuery object for input element
		var $input = $(input).attr("autocomplete", "off");
	
		// Apply inputClass if necessary
		if (options.inputClass) {
			$input.addClass(options.inputClass);
		}
	
		// Create results
		var results = document.createElement("div");
		$(results).addClass('tblholder').css('z-index', getHighestZ() + 50).css('margin-top', 0);
		$(results).css('clip', 'rect(0px,auto,auto,0px)').css('overflow', 'auto').css('max-height', '300px');
	
		// Create jQuery object for results
		// var $results = $(results);
		var $results = $(results).hide().addClass(options.resultsClass).css("position", "absolute");
		if( options.width > 0 ) {
			$results.css("width", options.width);
		}
	
		// Add to body element
		$("body").append(results);
	
		input.autocompleter = me;
	
		var timeout = null;
		var prev = "";
		var active = -1;
		var cache = {};
		var keyb = false;
		// hasFocus was false by default, see if making it true helps
		var hasFocus = true;
		var hasNoResults = false;
		var lastKeyPressCode = null;
		var mouseDownOnSelect = false;
		var hidingResults = false;
	
		// flush cache
		function flushCache(){
			cache = {};
			cache.data = {};
			cache.length = 0;
		};
	
		// flush cache
		flushCache();
	
		// if there is a data array supplied
		if( options.data != null ){
			var sFirstChar = "", stMatchSets = {}, row = [];
	
			// no url was specified, we need to adjust the cache length to make sure it fits the local data store
			if( typeof options.url != "string" ) {
				options.cacheLength = 1;
			}
	
			// loop through the array and create a lookup structure
			for( var i=0; i < options.data.length; i++ ){
				// if row is a string, make an array otherwise just reference the array
				row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);
	
				// if the length is zero, don't add to list
				if( row[0].length > 0 ){
					// get the first character
					sFirstChar = row[0].substring(0, 1).toLowerCase();
					// if no lookup array for this character exists, look it up now
					if( !stMatchSets[sFirstChar] ) stMatchSets[sFirstChar] = [];
					// if the match is a string
					stMatchSets[sFirstChar].push(row);
				}
			}
	
			// add the data items to the cache
			if ( options.cacheLength )
			{
				for( var k in stMatchSets ) {
					// increase the cache size
					options.cacheLength++;
					// add to the cache
					addToCache(k, stMatchSets[k]);
				}
			}
		}
	
		$input
		.keydown(function(e) {
			// track last key pressed
			lastKeyPressCode = e.keyCode;
			switch(e.keyCode) {
				case 38: // up
					e.preventDefault();
					moveSelect(-1);
					break;
				case 40: // down
					e.preventDefault();
					moveSelect(1);
					break;
				case 9:  // tab
				case 13: // return
					if( selectCurrent() ){
						// make sure to blur off the current field
						// (Enano edit - why do we want this, again?)
						// $input.get(0).blur();
						e.preventDefault();
					}
					break;
				default:
					active = -1;
					if (timeout) clearTimeout(timeout);
					timeout = setTimeout(function(){onChange();}, options.delay);
					break;
			}
		})
		.focus(function(){
			// track whether the field has focus, we shouldn't process any results if the field no longer has focus
			hasFocus = true;
		})
		.blur(function() {
			// track whether the field has focus
			hasFocus = false;
			if (!mouseDownOnSelect) {
				hideResults();
			}
		});
	
		hideResultsNow();
	
		function onChange() {
			// ignore if the following keys are pressed: [del] [shift] [capslock]
			if( lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32) ) return $results.hide();
			var v = $input.val();
			if (v == prev) return;
			prev = v;
			if (v.length >= options.minChars) {
				$input.addClass(options.loadingClass);
				requestData(v);
			} else {
				$input.removeClass(options.loadingClass);
				$results.hide();
			}
		};
	
		function moveSelect(step) {
	
			var lis = $("td", results);
			if (!lis || hasNoResults) return;
	
			active += step;
	
			if (active < 0) {
				active = 0;
			} else if (active >= lis.size()) {
				active = lis.size() - 1;
			}
	
			lis.removeClass("row2");
	
			$(lis[active]).addClass("row2");
			
			// scroll the results div
			// are we going up or down?
			var td_top = $dynano(lis[active]).Top() - $dynano(results).Top();
			var td_height = $dynano(lis[active]).Height();
			var td_bottom = td_top + td_height;
			var visibleTopBoundary = getScrollOffset(results);
			var results_height = $dynano(results).Height();
			var visibleBottomBoundary = visibleTopBoundary + results_height;
			var scrollTo = false;
			if ( td_top < visibleTopBoundary && step < 0 )
			{
				// going up: scroll the results div to just higher than the result we're trying to see
				scrollTo = td_top - 7;
			}
			else if ( td_bottom > visibleBottomBoundary && step > 0 )
			{
				// going down is a little harder, we want the result to be at the bottom
				scrollTo = td_top - results_height + td_height + 7;
			}
			if ( scrollTo )
			{
				results.scrollTop = scrollTo;
			}
	
			// Weird behaviour in IE
			// if (lis[active] && lis[active].scrollIntoView) {
			// 	lis[active].scrollIntoView(false);
			// }
	
		};
	
		function selectCurrent() {
			var li = $("td.row2", results)[0];
			if (!li) {
				var $li = $("td", results);
				if (options.selectOnly) {
					if ($li.length == 1) li = $li[0];
				} else if (options.selectFirst) {
					li = $li[0];
				}
			}
			if (li) {
				selectItem(li);
				return true;
			} else {
				return false;
			}
		};
	
		function selectItem(li) {
			if (!li) {
				li = document.createElement("li");
				li.extra = [];
				li.selectValue = "";
			}
			var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
			input.lastSelected = v;
			prev = v;
			$results.html("");
			$input.val(v);
			hideResultsNow();
			if (options.onItemSelect) {
				setTimeout(function() { options.onItemSelect(li) }, 1);
			}
		};
	
		// selects a portion of the input string
		function createSelection(start, end){
			// get a reference to the input element
			var field = $input.get(0);
			if( field.createTextRange ){
				var selRange = field.createTextRange();
				selRange.collapse(true);
				selRange.moveStart("character", start);
				selRange.moveEnd("character", end);
				selRange.select();
			} else if( field.setSelectionRange ){
				field.setSelectionRange(start, end);
			} else {
				if( field.selectionStart ){
					field.selectionStart = start;
					field.selectionEnd = end;
				}
			}
			field.focus();
		};
	
		// fills in the input box w/the first match (assumed to be the best match)
		function autoFill(sValue){
			// if the last user key pressed was backspace, don't autofill
			if( lastKeyPressCode != 8 ){
				// fill in the value (keep the case the user has typed)
				$input.val($input.val() + sValue.substring(prev.length));
				// select the portion of the value not typed by the user (so the next character will erase)
				createSelection(prev.length, sValue.length);
			}
		};
	
		function showResults() {
			// get the position of the input field right now (in case the DOM is shifted)
			var pos = findPos(input);
			// either use the specified width, or autocalculate based on form element
			var iWidth = (options.width > 0) ? options.width : $input.width();
			// reposition
			$results.css({
				width: parseInt(iWidth) + "px",
				top: (pos.y + input.offsetHeight) + "px",
				left: pos.x + "px"
			});
			if ( !$results.is(":visible") )
			{
				$results.show("blind", {}, 200);
			}
			else
			{
				$results.show();
			}
		};
	
		function hideResults() {
			if (timeout) clearTimeout(timeout);
			timeout = setTimeout(hideResultsNow, 200);
		};
	
		function hideResultsNow() {
			if (hidingResults) {
				return;
			}
			hidingResults = true;
		
			if (timeout) {
				clearTimeout(timeout);
			}
			
			var v = $input.removeClass(options.loadingClass).val();
			
			if ($results.is(":visible")) {
				$results.hide();
			}
			
			if (options.mustMatch) {
				if (!input.lastSelected || input.lastSelected != v) {
					selectItem(null);
				}
			}
	
			hidingResults = false;
		};
	
		function receiveData(q, data) {
			if (data) {
				$input.removeClass(options.loadingClass);
				results.innerHTML = "";
	
				// if the field no longer has focus or if there are no matches, do not display the drop down
				if( !hasFocus )
				{
					return hideResultsNow();
				}
				if ( data.length == 0 && !options.showWhenNoResults )
				{
					return hideResultsNow();
				}
				hasNoResults = false;
	
				if ($.browser.msie) {
					// we put a styled iframe behind the calendar so HTML SELECT elements don't show through
					$results.append(document.createElement('iframe'));
				}
				results.appendChild(dataToDom(data));
				// autofill in the complete box w/the first match as long as the user hasn't entered in more data
				if( options.autoFill && ($input.val().toLowerCase() == q.toLowerCase()) ) autoFill(data[0][0]);
				showResults();
			} else {
				hideResultsNow();
			}
		};
	
		function parseData(data) {
			if (!data) return null;
			var parsed = parseJSON(data);
			return parsed;
		};
	
		function dataToDom(data) {
			var ul = document.createElement("table");
			$(ul).attr("border", "0").attr("cellspacing", "1").attr("cellpadding", "3");
			var num = data.length;
			
			if ( options.tableHeader )
			{
				// fails in IE6
				try
				{
					ul.innerHTML = options.tableHeader;
				}
				catch ( e ) {};
			}
			
			if ( num == 0 )
			{
				// not showing any results
				if ( options.noResultsHTML )
					ul.innerHTML += options.noResultsHTML;
				
				hasNoResults = true;
				return ul;
			}
			
			// limited results to a max number
			if( (options.maxItemsToShow > 0) && (options.maxItemsToShow < num) ) num = options.maxItemsToShow;
			
			for (var i=0; i < num; i++) {
				var row = data[i];
				if (!row) continue;
				
				if ( typeof(row[0]) != 'string' )
				{
					// last ditch resort if it's a 1.1.4 autocomplete plugin that doesn't provide an automatic result.
					// hopefully this doesn't slow it down a lot.
					for ( var i in row )
					{
						if ( i == "0" || i == 0 )
							break;
						row[0] = row[i];
						break;
					}
				}
				
				var li = document.createElement("tr");
				var td = document.createElement("td");
				td.selectValue = row[0];
				$(td).addClass('row1');
				$(td).css("font-size", "smaller");
				
				if ( options.formatItem )
				{
					td.innerHTML = options.formatItem(row, i, num);
				}
				else
				{
					td.innerHTML = row[0];
				}
				li.appendChild(td);
				ul.appendChild(li);
				
				$(td).hover(
					function() { $("tr", ul).removeClass("row2"); $(this).addClass("row2"); active = $("tr", ul).indexOf($(this).get(0)); },
					function() { $(this).removeClass("row2"); }
				).click(function(e) { 
					e.preventDefault();
					e.stopPropagation();
					selectItem(this)
				});
			}
			
			$(ul).mousedown(function() {
				mouseDownOnSelect = true;
			}).mouseup(function() {
				mouseDownOnSelect = false;
			});
			return ul;
		};
	
		function requestData(q) {
			if (!options.matchCase) q = q.toLowerCase();
			var data = options.cacheLength ? loadFromCache(q) : null;
			// recieve the cached data
			if (data) {
				receiveData(q, data);
			// if an AJAX url has been supplied, try loading the data now
			} else if( (typeof options.url == "string") && (options.url.length > 0) ){
				$.get(makeUrl(q), function(data) {
					data = parseData(data);
					addToCache(q, data);
					receiveData(q, data);
				});
			// if there's been no data found, remove the loading class
			} else {
				$input.removeClass(options.loadingClass);
			}
		};
	
		function makeUrl(q) {
			var sep = options.url.indexOf('?') == -1 ? '?' : '&'; 
			var url = options.url + encodeURI(q);
			for (var i in options.extraParams) {
				url += "&" + i + "=" + encodeURI(options.extraParams[i]);
			}
			return url;
		};
	
		function loadFromCache(q) {
			if (!q) return null;
			if (cache.data[q]) return cache.data[q];
			if (options.matchSubset) {
				for (var i = q.length - 1; i >= options.minChars; i--) {
					var qs = q.substr(0, i);
					var c = cache.data[qs];
					if (c) {
						var csub = [];
						for (var j = 0; j < c.length; j++) {
							var x = c[j];
							var x0 = x[0];
							if (matchSubset(x0, q)) {
								csub[csub.length] = x;
							}
						}
						return csub;
					}
				}
			}
			return null;
		};
	
		function matchSubset(s, sub) {
			if (!options.matchCase) s = s.toLowerCase();
			var i = s.indexOf(sub);
			if (i == -1) return false;
			return i == 0 || options.matchContains;
		};
	
		this.flushCache = function() {
			flushCache();
		};
	
		this.setExtraParams = function(p) {
			options.extraParams = p;
		};
	
		this.findValue = function(){
			var q = $input.val();
	
			if (!options.matchCase) q = q.toLowerCase();
			var data = options.cacheLength ? loadFromCache(q) : null;
			if (data) {
				findValueCallback(q, data);
			} else if( (typeof options.url == "string") && (options.url.length > 0) ){
				$.get(makeUrl(q), function(data) {
					data = parseData(data)
					addToCache(q, data);
					findValueCallback(q, data);
				});
			} else {
				// no matches
				findValueCallback(q, null);
			}
		}
	
		function findValueCallback(q, data){
			if (data) $input.removeClass(options.loadingClass);
	
			var num = (data) ? data.length : 0;
			var li = null;
	
			for (var i=0; i < num; i++) {
				var row = data[i];
	
				if( row[0].toLowerCase() == q.toLowerCase() ){
					li = document.createElement("li");
					if (options.formatItem) {
						li.innerHTML = options.formatItem(row, i, num);
						li.selectValue = row[0];
					} else {
						li.innerHTML = row[0];
						li.selectValue = row[0];
					}
					var extra = null;
					if( row.length > 1 ){
						extra = [];
						for (var j=1; j < row.length; j++) {
							extra[extra.length] = row[j];
						}
					}
					li.extra = extra;
				}
			}
	
			if( options.onFindValue ) setTimeout(function() { options.onFindValue(li) }, 1);
		}
	
		function addToCache(q, data) {
			if (!data || !q || !options.cacheLength) return;
			if (!cache.length || cache.length > options.cacheLength) {
				flushCache();
				cache.length++;
			} else if (!cache[q]) {
				cache.length++;
			}
			cache.data[q] = data;
		};
	
		function findPos(obj) {
			var curleft = obj.offsetLeft || 0;
			var curtop = obj.offsetTop || 0;
			while (obj = obj.offsetParent) {
				curleft += obj.offsetLeft
				curtop += obj.offsetTop
			}
			return {x:curleft,y:curtop};
		}
	}
	
	jQuery.fn.autocomplete = function(url, options, data) {
		// Make sure options exists
		options = options || {};
		// Set url as option
		options.url = url;
		// set some bulk local data
		options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;
	
		// Set default values for required options
		options = $.extend({
			inputClass: "ac_input",
			resultsClass: "ac_results",
			lineSeparator: "\n",
			cellSeparator: "|",
			minChars: 1,
			delay: 400,
			matchCase: 0,
			matchSubset: 1,
			matchContains: 0,
			cacheLength: false,
			mustMatch: 0,
			extraParams: {},
			loadingClass: "ac_loading",
			selectFirst: false,
			selectOnly: false,
			maxItemsToShow: -1,
			autoFill: false,
			showWhenNoResults: false,
			width: 0
		}, options);
		options.width = parseInt(options.width, 10);
	
		this.each(function() {
			var input = this;
			new jQuery.autocomplete(input, options);
		});
	
		// Don't break the chain
		return this;
	}
	
	jQuery.fn.autocompleteArray = function(data, options) {
		return this.autocomplete(null, options, data);
	}
	
	jQuery.fn.indexOf = function(e){
		for( var i=0; i<this.length; i++ ){
			if( this[i] == e ) return i;
		}
		return -1;
	};
	
	autofill_onload();
};

addOnloadHook(autofill_init);
